Covering for electric conductors and method of preparing the same.



4 a resident of Brooklyn, county of Kings, and

. the same, the main object of my present .to cool until it reaches a temperature of Q iasac eatingli mal atmospheric temperatures.

corporated therein. The proportion of man- COVEBING FOB ELECTRIC GONDUCTORS AND METHOD OF PREPARING THE No Drawing.

To all whom it may concern:

Be it known that I, EUGENE T. TRo'rrEn, a citizen of the United States of America, and

State of New York, have invented certain new and useful Improvements in Coverings for Electric Conductors and Methods ,of' Preparing the Same, of which the following is a specification.

My invention relates to coverings for electric conductors and methods of producing invention being to treat an ordinary insulated conductor in such a way that the insulation thereof shall be rendered water and flame-proof. In carrying out my invention I apply a W V the exterior of insulated condiic'tors, 'such plastic compound being of such a nature as to be plastic or fluid when at a temperature considerably above that of the normal atmospheric temperature, yet becomes hard and solid at and around nor- The composition which I have heretofore found as giving good results comprises stearin pitch and manganese oxid in the proportion o five parts of the former to one part of the latter. The stearin pitch may be heated for several hours,four hours being the duration of time I have successfully employed, at a temperature of about 350 degrees Fahrenheit. Thereafter the pitch may be allowed about 240 degrees Fahrenheit at which time the manganese oxid may be gradually inganese oxid employed may of course be varied to suit individual requirements. The material may be agitated so as to cause a thorough mixture of the constituent parts after which it is ready for use and may be applied toa conductor in any suitable manner-such as by the methods commonly employed for this purpose,for instance, the conductor may be drawn through a bath containing this material, the surplus or excess material being wiped off or otherwise removed if necessary. Thereafter and While the compound is still hot, and hence in a plastic and sticky condition, I preferably apply powdered mica thereto in quantities l UNITED STATES PATENT E- BaooxI-Yn, NEW YORK.

sum.

Specification of Letters Patent. v Patented July 22, 1913. Application filed November 8, 1910. Serial No. 591,380.

SEARCH ROOM just sufiicient to substantially cover the ex- The mica will adhere to the plastic compound because of its sticky condition and will become substantially incorporated therein so that it will become a permanent part of the finished article when the plastic compound is finally dry and hard. The application of the mica maybe accomplished in any suitable manner as by drawing the coated conductor through a vessel containing the mica, the surplus or excess quantity, if desired, being brushed, wiped, or scraped oil. Thereafter the conductor so prepared is allowed to dry and is then ready for use.

terior of the coated article.

The plastic compound composed of stearin pitch and manganese oxid has both waterproof and flame-proof qualities to a high degree. fWhile it is not actually fire-proof, in that the flame from a Bunsen burner will consume it, yet it is flame-proof tothe extent that if the Bunsen burner be removed the flame will not travel beyond the point where the flame from the burner was applied.

The mica covering produces a fine finish, the co-efiicient of friction of which is relatively low so that the drawing of the conductors through conduits will be facilitated.

Moreover, it p otects the com on d penga th ms ed article will i't'to the extent a withstand the standard test adopted by companies using such articles, viz., 'that it will not stain paper upon which it is laid when subjcted to a temperature of'130 degrees Fahrenheit for thirty minutes. Moreover, the mica finish produces a lustrous effect which is pleasing and attractive to the eye.

Again the composition is of such a character that it will not be unduly brittle at low temperatures, that is to say, it will not crack or break at any temperature to which such articles are normally subjected.

What I claim is:

1. A covering for insulating material of electric conductors consisting of a waterproofing and flame-resisting coating, comprising stearin pitch and manganese oxid in the proportion of five parts of the former to one part of the latter.

2. The herein described method of preparing a water-proofing and flame-resisting Q 1,067,951 4 ompound which consists in subjecting parts of stearin and mixing he two stearinf pitch for several hours to a tempefiramaterials thoroug 1y.; n a ture 0 about 350 degrees Fahrenheit t en v lowering the temperature thereof to about EUGENE-T TI 5 240 degrees Fehrenheit, andin then adding 1 Witnesses:

manganese oxld thereto in the proportion v D. HOWARD I'IAYWOOD v of abouj: one part manganese oxi d to five LYMAN S. ANnn Ws, r. 

